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@uitrit tetes gutem @frn BENJAMIN F. BEE, OF HARWICH, MASSACHUSETTS, ASSIGNOR TO THE NEW YORK TAP AND DIE COMPANY, OF NEW YORK CITY.

Letters .Patent No. 80,327, dated July 28, 1868.

IMPROVEMENT IN GENTRING-LATHES.

Be it known that I, BENJAMIN F. BEE, oi' Harwich, in thc county of Barnstable,randState of Massachusetts, have invented a new-and useful Improvement in Oentring-Lathes; and I do hereby declare that the fol- TO ALL WHOM IT MAY CONCERN:

lowing is a full, clear, and exact description thereof, which will enable others skilled in the art to make and Ause the same, reference being had to the accompanying drawings, formingr part of this specification, in which- Figure 1 is a plan or-top view of my invention.

Figure 2, a side view of the same.

Figure 3, a detached longitudinal vertical section of the ecntring-attachment.

Figure 4, a detached side view of the same.

Figure 5, a. detached side view of one of the jaws of the same.

Figure 6, plan or top view of fig. 5.

Figure 7, a detached longitudinal vertical section of 'thejaw pertaining to the-device.

Figure 8, a plan or top view of fig.' 7: p

Similar letters of reference indicate corresponding parts. o

This invention relates to a new and improved centring-lathe, designed for centring articles, that is, adjusting their ends centrally in line with the hit of the lathe, so that the. article may he drilled centrally or have centre-holes made properly in their ends, in orderthat'thcy may be fitted centrally in a turning-lathe.

In the accompanying sheet of drawings- A represents the'hed .of thc lathe,`

B the stationary -or fixed head,

C the rotary sliding mandrel inthe head B, the sliding movement being given. thef mandrel by a lever D, and

E the cone of pulleys around which the band passes which gives the rotary motion to the mandrel.

These parts being oldand well known, do not require a special description.

F represents a metallic bar, which is secured transversely on the'bed A byaclamp, G, shown in fig. 3. This bar F is grooved at one side, so as to receive the slides II I, one, H, being placed above the other, I, and both allowed 'to move or work freely in a horizontal direction. These two slidesare retained in proper position Vin the groove or recess in the bar F by means of n plate, J, secured to the side of F-hyscrews a.

The slides lI I arc'provided respectively with inclined shoulders, la c, between which a vertical V-shaped plate, K, is fitted, (see incre particularly Eg. 3,) and the rear ends of the slides are connected with springs, del', which keep theshouldcrs [lo incontact with the inclined sides of the plate K, the spring d, of the slide Il, having a.

4- tendency to draw the latter in the direction indicated by arrow 1, and the spring d of the other slide I,`ihaving a tendency to push the latter in thc direction indicated hy arrow 2, (see The lower slide I projects out considerably further than the upperslide II, and has ajaw, L, secured upon its upper4 surface at its outer end` This jaw is composed of two side-plates, e e, each of which has a V-shaped notch,f, made in its inner edge, the plates c e being secured by a pin or lacy, g, to the sides of I, which, at its outerend, projects upward a suitable distance to admit oi thejaw L being in linc with slide I-I, (see figs. 3 and 4.)

M isV a jaw formed ot' a single plate, with a V shaped notch, t, made in its face-side, whiclrnotch corresponds in position or coincides with the notchesffin the plates e e of the jaw L. The jaw M is of' such a width that it may pass between the plates e e of thejaw L when the two jaws are moved towards each other, (sce g. 4.)

The plate K has its sides inclined upward and outward, as shown clearly in figs. 3 and 4, and thel lower end of said plate is connected by a rod, gx, with a treadle, N, by pressing down which the two jaws L M are made to approach each other, and firmly grasp the article to he centred, and bring it in line with a drill', z, fitted in i the mandrel C, the jaws L M having such a relative position with the bit as to ellcct this result. Owing to the notches in the jaws, they are made to grasp cylindrical and other`-shaped articles, and properly present their ends to the hir.

devices may be applied to the lathe of s, the centringsition while being operitate the centring of longL article d hold the article firmly in po In order to facil s. 1 and 2, in order to steady en the bed, as shown in tig ated upon. p

Having thus described my invention, l claim as new, and desire to secure byLetters Patent- The two slides H I, provided respectively with the jaws M L, in connection with the top plate K connected with the treadle N and-the springs d d', all arranged and applied to a. centring-lathc to operate in the manner substantially as and for the purpose set forth.

" BENJAMIN F. BEE.

Witnesses:

S. DAvts KEENE, F. T. SPENCER. 

